adafruit · dhalbert · Aug 28, 2019 · Jul 26, 2019 · Aug 23, 2019 · Aug 27, 2019
diff --git a/lib/utils/buffer_helper.c b/lib/utils/buffer_helper.c
@@ -26,10 +26,10 @@
 
 #include "lib/utils/buffer_helper.h"
 
-void normalize_buffer_bounds(int32_t* start, int32_t end, uint32_t* length) {
+void normalize_buffer_bounds(int32_t* start, int32_t end, size_t* length) {
     if (end < 0) {
         end += *length;
-    } else if (((uint32_t) end) > *length) {
+    } else if (((size_t) end) > *length) {
         end = *length;
     }
     if (*start < 0) {

diff --git a/lib/utils/buffer_helper.h b/lib/utils/buffer_helper.h
@@ -28,7 +28,8 @@
 #define MICROPY_INCLUDED_LIB_UTILS_BUFFER_HELPER_H
 
 #include <stdint.h>
+#include <string.h>
 
-void normalize_buffer_bounds(int32_t* start, int32_t end, uint32_t* length);
+void normalize_buffer_bounds(int32_t* start, int32_t end, size_t* length);
 
 #endif  // MICROPY_INCLUDED_LIB_UTILS_BUFFER_HELPER_H
diff --git a/ports/atmel-samd/boards/gemma_m0/mpconfigboard.h b/ports/atmel-samd/boards/gemma_m0/mpconfigboard.h
@@ -6,8 +6,6 @@
 #define MICROPY_HW_APA102_MOSI   (&pin_PA00)
 #define MICROPY_HW_APA102_SCK    (&pin_PA01)
 
-// #define CIRCUITPY_BITBANG_APA102
-
 #define MICROPY_PORT_A        (PORT_PA00 | PORT_PA01 | PORT_PA24 | PORT_PA25)
 #define MICROPY_PORT_B        (0)
 #define MICROPY_PORT_C        (0)

diff --git a/ports/atmel-samd/boards/itsybitsy_m0_express/mpconfigboard.h b/ports/atmel-samd/boards/itsybitsy_m0_express/mpconfigboard.h
@@ -3,7 +3,6 @@
 
 #define MICROPY_HW_LED_STATUS   (&pin_PA17)
 
-#define CIRCUITPY_BITBANG_APA102
 #define MICROPY_HW_APA102_MOSI   (&pin_PA01)
 #define MICROPY_HW_APA102_SCK    (&pin_PA00)
 

diff --git a/ports/atmel-samd/boards/itsybitsy_m0_express/mpconfigboard.mk b/ports/atmel-samd/boards/itsybitsy_m0_express/mpconfigboard.mk
@@ -12,6 +12,9 @@ EXTERNAL_FLASH_DEVICE_COUNT = 2
 EXTERNAL_FLASH_DEVICES = "W25Q16FW, GD25Q16C"
 LONGINT_IMPL = MPZ
 
+CIRCUITPY_BITBANG_APA102 = 1
+
+CIRCUITPY_BITBANGIO = 0
 CIRCUITPY_GAMEPAD = 0
 CIRCUITPY_I2CSLAVE = 0
 CIRCUITPY_RTC = 0

diff --git a/ports/atmel-samd/boards/itsybitsy_m4_express/mpconfigboard.h b/ports/atmel-samd/boards/itsybitsy_m4_express/mpconfigboard.h
@@ -9,8 +9,6 @@
 #define MICROPY_HW_APA102_MOSI   (&pin_PB03)
 #define MICROPY_HW_APA102_SCK    (&pin_PB02)
 
-#define CIRCUITPY_BITBANG_APA102
-
 // These are pins not to reset.
 // QSPI Data pins
 #define MICROPY_PORT_A (PORT_PA08 | PORT_PA09 | PORT_PA10 | PORT_PA11)

diff --git a/ports/atmel-samd/boards/itsybitsy_m4_express/mpconfigboard.mk b/ports/atmel-samd/boards/itsybitsy_m4_express/mpconfigboard.mk
@@ -15,3 +15,5 @@ LONGINT_IMPL = MPZ
 CIRCUITPY_PS2IO = 1
 # No I2S on SAMD51G
 CIRCUITPY_AUDIOBUSIO = 0
+
+CIRCUITPY_BITBANG_APA102 = 1
diff --git a/ports/atmel-samd/boards/mini_sam_m4/mpconfigboard.h b/ports/atmel-samd/boards/mini_sam_m4/mpconfigboard.h
@@ -9,8 +9,6 @@
 #define MICROPY_HW_APA102_MOSI   (&pin_PB03)
 #define MICROPY_HW_APA102_SCK    (&pin_PB02)
 
-#define CIRCUITPY_BITBANG_APA102
-
 // These are pins not to reset.
 // QSPI Data pins
 #define MICROPY_PORT_A (PORT_PA08 | PORT_PA09 | PORT_PA10 | PORT_PA11)

diff --git a/ports/atmel-samd/boards/mini_sam_m4/mpconfigboard.mk b/ports/atmel-samd/boards/mini_sam_m4/mpconfigboard.mk
@@ -15,3 +15,5 @@ LONGINT_IMPL = MPZ
 CIRCUITPY_PS2IO = 1
 # No I2S on SAMD51G
 CIRCUITPY_AUDIOBUSIO = 0
+
+CIRCUITPY_BITBANG_APA102 = 1
diff --git a/ports/atmel-samd/boards/pirkey_m0/mpconfigboard.h b/ports/atmel-samd/boards/pirkey_m0/mpconfigboard.h
@@ -4,8 +4,6 @@
 #define MICROPY_HW_APA102_MOSI   (&pin_PA00)
 #define MICROPY_HW_APA102_SCK    (&pin_PA01)
 
-// #define CIRCUITPY_BITBANG_APA102
-
 #define MICROPY_PORT_A        (PORT_PA00 | PORT_PA01 | PORT_PA24 | PORT_PA25)
 #define MICROPY_PORT_B        (0)
 #define MICROPY_PORT_C        (0)

diff --git a/ports/atmel-samd/boards/trellis_m4_express/mpconfigboard.h b/ports/atmel-samd/boards/trellis_m4_express/mpconfigboard.h
@@ -8,8 +8,6 @@
 #define MICROPY_HW_APA102_MOSI   (&pin_PB03)
 #define MICROPY_HW_APA102_SCK    (&pin_PB02)
 
-#define CIRCUITPY_BITBANG_APA102
-
 // These are pins not to reset.
 // QSPI Data pins
 #define MICROPY_PORT_A (PORT_PA08 | PORT_PA09 | PORT_PA10 | PORT_PA11)

diff --git a/ports/atmel-samd/boards/trellis_m4_express/mpconfigboard.mk b/ports/atmel-samd/boards/trellis_m4_express/mpconfigboard.mk
@@ -15,3 +15,5 @@ LONGINT_IMPL = MPZ
 CIRCUITPY_PS2IO = 1
 # No I2S on SAMD51G
 CIRCUITPY_AUDIOBUSIO = 0
+
+CIRCUITPY_BITBANG_APA102 = 1
diff --git a/ports/atmel-samd/common-hal/busio/SPI.c b/ports/atmel-samd/common-hal/busio/SPI.c
@@ -122,7 +122,7 @@ void common_hal_busio_spi_construct(busio_spi_obj_t *self,
         }
         Sercom* potential_sercom = sercom_insts[sercom_index];
         if (
-        #if defined(MICROPY_HW_APA102_SCK) && defined(MICROPY_HW_APA102_MOSI) && !defined(CIRCUITPY_BITBANG_APA102)
+        #if defined(MICROPY_HW_APA102_SCK) && defined(MICROPY_HW_APA102_MOSI) && !CIRCUITPY_BITBANG_APA102
             (potential_sercom->SPI.CTRLA.bit.ENABLE != 0 &&
              potential_sercom != status_apa102.spi_desc.dev.prvt &&
              !apa102_sck_in_use)) {
@@ -181,7 +181,7 @@ void common_hal_busio_spi_construct(busio_spi_obj_t *self,
     // Set up SPI clocks on SERCOM.
     samd_peripherals_sercom_clock_init(sercom, sercom_index);
 
-    #if defined(MICROPY_HW_APA102_SCK) && defined(MICROPY_HW_APA102_MOSI) && !defined(CIRCUITPY_BITBANG_APA102)
+    #if defined(MICROPY_HW_APA102_SCK) && defined(MICROPY_HW_APA102_MOSI) && !CIRCUITPY_BITBANG_APA102
     // if we're re-using the dotstar sercom, make sure it is disabled or the init will fail out
     hri_sercomspi_clear_CTRLA_ENABLE_bit(sercom);
     #endif

diff --git a/py/circuitpy_defns.mk b/py/circuitpy_defns.mk
@@ -117,6 +117,10 @@ endif
 ifeq ($(CIRCUITPY_BITBANGIO),1)
 SRC_PATTERNS += bitbangio/%
 endif
+# Some builds need bitbang SPI for the dotstar but don't make bitbangio available so include it separately.
+ifeq ($(CIRCUITPY_BITBANG_APA102),1)
+SRC_PATTERNS += bitbangio/SPI%
+endif
 ifeq ($(CIRCUITPY_BLEIO),1)
 SRC_PATTERNS += bleio/%
 endif

diff --git a/py/circuitpy_mpconfig.mk b/py/circuitpy_mpconfig.mk
@@ -278,3 +278,9 @@ ifndef CIRCUITPY_USTACK
 CIRCUITPY_USTACK = 0
 endif
 CFLAGS += -DCIRCUITPY_USTACK=$(CIRCUITPY_USTACK)
+
+
+ifndef CIRCUITPY_BITBANG_APA102
+CIRCUITPY_BITBANG_APA102 = 0
+endif
+CFLAGS += -DCIRCUITPY_BITBANG_APA102=$(CIRCUITPY_BITBANG_APA102)
diff --git a/shared-bindings/bitbangio/I2C.c b/shared-bindings/bitbangio/I2C.c
@@ -175,6 +175,23 @@ MP_DEFINE_CONST_FUN_OBJ_1(bitbangio_i2c_unlock_obj, bitbangio_i2c_obj_unlock);
 //|      :param int start: Index to start writing at
 //|      :param int end: Index to write up to but not include
 //|
+// Shared arg parsing for readfrom_into and writeto_then_readfrom.
+STATIC void readfrom(bitbangio_i2c_obj_t *self, mp_int_t address, mp_obj_t buffer, int32_t start, mp_int_t end) {
+    mp_buffer_info_t bufinfo;
+    mp_get_buffer_raise(buffer, &bufinfo, MP_BUFFER_WRITE);
+
+    size_t length = bufinfo.len;
+    normalize_buffer_bounds(&start, end, &length);
+    if (length == 0) {
+        mp_raise_ValueError(translate("Buffer must be at least length 1"));
+    }
+
+    uint8_t status = shared_module_bitbangio_i2c_read(self, address, ((uint8_t*)bufinfo.buf) + start, length);
+    if (status != 0) {
+        mp_raise_OSError(status);
+    }
+}
+
 STATIC mp_obj_t bitbangio_i2c_readfrom_into(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
     enum { ARG_address, ARG_buffer, ARG_start, ARG_end };
     static const mp_arg_t allowed_args[] = {
@@ -185,33 +202,21 @@ STATIC mp_obj_t bitbangio_i2c_readfrom_into(size_t n_args, const mp_obj_t *pos_a
     };
     bitbangio_i2c_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
     check_for_deinit(self);
+    check_lock(self);
     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
     mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
-    check_lock(self);
-    mp_buffer_info_t bufinfo;
-    mp_get_buffer_raise(args[ARG_buffer].u_obj, &bufinfo, MP_BUFFER_WRITE);
 
-    int32_t start = args[ARG_start].u_int;
-    uint32_t length = bufinfo.len;
-    normalize_buffer_bounds(&start, args[ARG_end].u_int, &length);
-    if (length == 0) {
-        mp_raise_ValueError(translate("Buffer must be at least length 1"));
-    }
-    uint8_t status = shared_module_bitbangio_i2c_read(self,
-                                                      args[ARG_address].u_int,
-                                                      ((uint8_t*)bufinfo.buf) + start,
-                                                      length);
-    if (status != 0) {
-        mp_raise_OSError(status);
-    }
+    readfrom(self, args[ARG_address].u_int, args[ARG_buffer].u_obj, args[ARG_start].u_int,
+             args[ARG_end].u_int);
     return mp_const_none;
 }
 MP_DEFINE_CONST_FUN_OBJ_KW(bitbangio_i2c_readfrom_into_obj, 3, bitbangio_i2c_readfrom_into);
 
 //|   .. method:: writeto(address, buffer, *, start=0, end=None, stop=True)
 //|
-//|      Write the bytes from ``buffer`` to the slave specified by ``address``.
-//|      Transmits a stop bit if ``stop`` is set.
+//|      Write the bytes from ``buffer`` to the slave specified by ``address`` and then transmits a
+//|      stop bit. Use `writeto_then_readfrom` when needing a write, no stop and repeated start
+//|      before a read.
 //|
 //|      If ``start`` or ``end`` is provided, then the buffer will be sliced
 //|      as if ``buffer[start:end]``. This will not cause an allocation like
@@ -224,9 +229,27 @@ MP_DEFINE_CONST_FUN_OBJ_KW(bitbangio_i2c_readfrom_into_obj, 3, bitbangio_i2c_rea
 //|      :param bytearray buffer: buffer containing the bytes to write
 //|      :param int start: Index to start writing from
 //|      :param int end: Index to read up to but not include
-//|      :param bool stop: If true, output an I2C stop condition after the
-//|                        buffer is written
+//|      :param bool stop: If true, output an I2C stop condition after the buffer is written.
+//|                        Deprecated. Will be removed in 6.x and act as stop=True.
 //|
+// Shared arg parsing for writeto and writeto_then_readfrom.
+STATIC void writeto(bitbangio_i2c_obj_t *self, mp_int_t address, mp_obj_t buffer, int32_t start, mp_int_t end, bool stop) {
+    // get the buffer to write the data from
+    mp_buffer_info_t bufinfo;
+    mp_get_buffer_raise(buffer, &bufinfo, MP_BUFFER_READ);
+
+    size_t length = bufinfo.len;
+    normalize_buffer_bounds(&start, end, &length);
+
+    // do the transfer
+    uint8_t status = shared_module_bitbangio_i2c_write(self, address,
+                                                       ((uint8_t*) bufinfo.buf) + start, length,
+                                                       stop);
+    if (status != 0) {
+        mp_raise_OSError(status);
+    }
+}
+
 STATIC mp_obj_t bitbangio_i2c_writeto(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
     enum { ARG_address, ARG_buffer, ARG_start, ARG_end, ARG_stop };
     static const mp_arg_t allowed_args[] = {
@@ -242,23 +265,56 @@ STATIC mp_obj_t bitbangio_i2c_writeto(size_t n_args, const mp_obj_t *pos_args, m
     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
     mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
-    // get the buffer to write the data from
-    mp_buffer_info_t bufinfo;
-    mp_get_buffer_raise(args[ARG_buffer].u_obj, &bufinfo, MP_BUFFER_READ);
+    writeto(self, args[ARG_address].u_int, args[ARG_buffer].u_obj, args[ARG_start].u_int,
+            args[ARG_end].u_int, args[ARG_stop].u_bool);
+    return mp_const_none;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_KW(bitbangio_i2c_writeto_obj, 1, bitbangio_i2c_writeto);
 
-    int32_t start = args[ARG_start].u_int;
-    uint32_t length = bufinfo.len;
-    normalize_buffer_bounds(&start, args[ARG_end].u_int, &length);
 
-    // do the transfer
-    uint8_t status = shared_module_bitbangio_i2c_write(self, args[ARG_address].u_int,
-        ((uint8_t*) bufinfo.buf) + start, length, args[ARG_stop].u_bool);
-    if (status != 0) {
-        mp_raise_OSError(status);
-    }
+//|   .. method:: writeto_then_readfrom(address, out_buffer, in_buffer, *, out_start=0, out_end=None, in_start=0, in_end=None)
+//|
+//|      Write the bytes from ``out_buffer`` to the slave specified by ``address``, generate no stop
+//|      bit, generate a repeated start and read into ``in_buffer``. ``out_buffer`` and
+//|      ``in_buffer`` can be the same buffer because they are used sequentially.
+//|
+//|      If ``start`` or ``end`` is provided, then the corresponding buffer will be sliced
+//|      as if ``buffer[start:end]``. This will not cause an allocation like ``buf[start:end]``
+//|      will so it saves memory.
+//|
+//|      :param int address: 7-bit device address
+//|      :param bytearray out_buffer: buffer containing the bytes to write
+//|      :param bytearray in_buffer: buffer to write into
+//|      :param int out_start: Index to start writing from
+//|      :param int out_end: Index to read up to but not include. Defaults to ``len(buffer)``
+//|      :param int in_start: Index to start writing at
+//|      :param int in_end: Index to write up to but not include. Defaults to ``len(buffer)``
+//|
+STATIC mp_obj_t bitbangio_i2c_writeto_then_readfrom(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+    enum { ARG_address, ARG_out_buffer, ARG_in_buffer, ARG_out_start, ARG_out_end, ARG_in_start, ARG_in_end };
+    static const mp_arg_t allowed_args[] = {
+        { MP_QSTR_address,    MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = 0} },
+        { MP_QSTR_out_buffer, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
+        { MP_QSTR_in_buffer,  MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
+        { MP_QSTR_out_start,  MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
+        { MP_QSTR_out_end,    MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = INT_MAX} },
+        { MP_QSTR_in_start,   MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
+        { MP_QSTR_in_end,     MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = INT_MAX} },
+    };
+    bitbangio_i2c_obj_t *self = MP_OBJ_TO_PTR(pos_args[0]);
+    check_for_deinit(self);
+    check_lock(self);
+    mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+    mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+
+    writeto(self, args[ARG_address].u_int, args[ARG_out_buffer].u_obj, args[ARG_out_start].u_int,
+            args[ARG_out_end].u_int, false);
+    readfrom(self, args[ARG_address].u_int, args[ARG_in_buffer].u_obj, args[ARG_in_start].u_int,
+             args[ARG_in_end].u_int);
+
     return mp_const_none;
 }
-STATIC MP_DEFINE_CONST_FUN_OBJ_KW(bitbangio_i2c_writeto_obj, 1, bitbangio_i2c_writeto);
+MP_DEFINE_CONST_FUN_OBJ_KW(bitbangio_i2c_writeto_then_readfrom_obj, 3, bitbangio_i2c_writeto_then_readfrom);
 
 STATIC const mp_rom_map_elem_t bitbangio_i2c_locals_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_deinit), MP_ROM_PTR(&bitbangio_i2c_deinit_obj) },
@@ -271,6 +327,7 @@ STATIC const mp_rom_map_elem_t bitbangio_i2c_locals_dict_table[] = {
 
     { MP_ROM_QSTR(MP_QSTR_writeto), MP_ROM_PTR(&bitbangio_i2c_writeto_obj) },
     { MP_ROM_QSTR(MP_QSTR_readfrom_into), MP_ROM_PTR(&bitbangio_i2c_readfrom_into_obj) },
+    { MP_ROM_QSTR(MP_QSTR_writeto_then_readfrom), MP_ROM_PTR(&bitbangio_i2c_writeto_then_readfrom_obj) },
 };
 
 STATIC MP_DEFINE_CONST_DICT(bitbangio_i2c_locals_dict, bitbangio_i2c_locals_dict_table);

diff --git a/shared-bindings/bitbangio/SPI.c b/shared-bindings/bitbangio/SPI.c
@@ -275,13 +275,13 @@ STATIC mp_obj_t bitbangio_spi_write_readinto(size_t n_args, const mp_obj_t *pos_
     mp_buffer_info_t buf_out_info;
     mp_get_buffer_raise(args[ARG_buffer_out].u_obj, &buf_out_info, MP_BUFFER_READ);
     int32_t out_start = args[ARG_out_start].u_int;
-    uint32_t out_length = buf_out_info.len;
+    size_t out_length = buf_out_info.len;
     normalize_buffer_bounds(&out_start, args[ARG_out_end].u_int, &out_length);
 
     mp_buffer_info_t buf_in_info;
     mp_get_buffer_raise(args[ARG_buffer_in].u_obj, &buf_in_info, MP_BUFFER_WRITE);
     int32_t in_start = args[ARG_in_start].u_int;
-    uint32_t in_length = buf_in_info.len;
+    size_t in_length = buf_in_info.len;
     normalize_buffer_bounds(&in_start, args[ARG_in_end].u_int, &in_length);
 
     if (out_length != in_length) {